> On Jul 29, 2016, at 5:55 PM, Jacob Bandes-Storch via swift-evolution
> <swift-evolut...@swift.org> wrote:
>
> • a top-of-file "shebang"-style comment indicating the version,
> something like //#swift(4), mirroring the "#if swift" syntax
`import Swift 3.1`?
I think this brings up two interesting questions:
* Do we want to be able to mix files using different versions of Swift in the
same module?
* Do we want to extend these backwards compatibility features beyond the
standard library to other modules?
If the answer to both is "yes", then the compiler can just treat the version of
the `Swift` module specially, using it to adjust the language syntax in
addition to the standard library interface. The command-line switch can be one
that provides a default version for imports with unspecified versions, like:
--version Swift=3.1 --version SomeJSON=1.2
--
Brent Royal-Gordon
Architechies
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